flowchart LR
  Start[Start]
  Stop[Stop]
  Start --> Plus([<tt>+</tt>]) ---> Stop
  Start --> Minus([<tt>-</tt>]) ---> Stop
  Start --> Not([<tt>not</tt>]) ---> Stop
  Start --> At([<tt>@</tt>]) ---> Stop
  Start --->|&nbsp;#40;1#41;&nbsp;| AtAt([<tt>@@</tt>]) --> Stop

  style Start fill:#44E
  style Stop fill:#E44